fix: transport AppImage args via env and gate restart on app-ping

- Transport Linux AppImage CLI args through SUBMINER_APP_ARGC/ARG_* env vars instead of argv
- Add --app-ping command to probe single-instance lock ownership (exit 0 = running, 1 = not)
- Gate manual restart: poll app-ping until old app releases lock, then until new app owns it
- Preserve user-paused playback when disarming the auto-play-ready gate on restart
- Snapshot subtitles before connection side effects (sub-visibility hide) can suppress them
- Reapply overlay bounds after first show for Hyprland compatibility

src/core/services/mpv.ts

@@ -186,12 +186,12 @@ export class MpvIpcClient implements MpvClient {
         this.connected = true;
         this.connecting = false;
         this.socket = this.transport.getSocket();
-        this.emit('connection-change', { connected: true });
         this.reconnectAttempt = 0;
         this.hasConnectedOnce = true;
         this.setSecondarySubVisibility(false);
         subscribeToMpvProperties(this.send.bind(this));
         requestMpvInitialState(this.send.bind(this));
+        this.emit('connection-change', { connected: true });
 
         const shouldAutoStart =
           this.deps.autoStartOverlay || this.deps.getResolvedConfig().auto_start_overlay === true;